An experimental comparison of localization accuracy of affine region detectors

Previous comparison about localization accuracy of affine region detectors is focused on the overlap error between corresponding regions, which is not sufficient for some applications such as wide baseline matching, registration, structure from motion etc., in which localization accuracy in position is especially important. In this paper, we make a experimental comparison about the localization accuracy of position of CGR(Center of Gravity of Region) of the detected corresponding regions on a set of test images under varying conditions. Three methods of the state of the art in affine region detectors are included: MSER, Hessians Affine and Harris Affine. This comparison is complementary with previous similar work. The performance is measured against changes in viewpoint, scale, illumination, defocus and image compression.